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PestWatch Report on August 9, 2017

Posted: August 9, 2017

Although CEW are low in most locations, captures can change rapidly at this time of year. Spray thresholds for CEW are being exceeded in Erie and Lancaster Counties. ECB and FAW counts are low. Also be aware that brown marmorated stink bug tends to move into sweet corn in August.
Corn earworm trap in Montgomery County, PA. Photo: A. Frankenfield, Penn State

Corn earworm trap in Montgomery County, PA. Photo: A. Frankenfield, Penn State

Corn earworm (CEW) counts have decreased in the last week, although not in Erie County. Populations may be getting diluted into nearby field corn if that field corn is silking. The most recent counts suggest sites at a 4-5 day interval in Erie County. and sites at either 4-5, or 5-6 day spray interval in Lancaster County. Counts can change rapidly at this time of year.

European corn borer (ECB) counts are low.

Fall armyworm (FAW) counts are also low, except in Erie County.

cew map 8-9-17

ecb map 8-9-17

faw map 8-9-17

spray count legend

COUNTY FARM/TRAP NAME CEW
25-Jul
CEW
1-Aug
CEW
8-Aug
ECB
25-Jul
ECB
1-Aug
ECB
8-Aug
FAW
25-Jul
FAW
1-Aug
FAW
8-Aug
Blair Curryville, PA (Blair) 5 0 0 0 0 0 3 0 0
Blair Hollidaysburg, PA (Blair) 5 0 0 11 0 0 0 0 0
Blair Tyrone, PA (Blair) 35 6 null 7 0 null 5 6 null
Bradford Bristol's Produce 0 null 0 0 null 2.1 null null 1.4
Bradford Larue's Produce null null 0 null null 1.5 null null 4.2
Bradford Shores Sisters Produce 0 null 0 0 null 9.1


Bucks Bedminster 0 0 7 0 0 0


Bucks Buckingham null 7 null null 23.5 null


Centre Harner 1.2 2 1.8 15.2 0 0.9 1.2 1 0
Centre Rock Springs 33.8 2.6 3 5.8 2 5.3 8.2 8 2.6
Centre Stormstown 15.2 2 5.3 1.2 0 0 7 16 6.1
Clinton Loganton 4.7 null 2 16.3 null 10.5


Erie Dudas Farm 17 6 0


4 9 1
Erie Mason 74 53 38


30 18 22
Fayette Duda's Farm Inc. 42 17 null 1 10 null 20 0 null
Huntingdon New Morning Farm 5.3 14 7 78.8 49 4.7


Indiana Brush Valley 1 2 0 0 0 0 6 1 4
Indiana Creekside 32 0 0


2 2 0
Lackawanna Ransom null 0 null null 3 null


Lancaster Landisville 7 0 16 2 7 10 0 0 0
Lancaster Neffsville 3 null 18 3 null 0 0 null 0
Lancaster New Danville 6 14 42 3 7 4 0 2 0
Lehigh Germansville 76 18 2 0 0 0 4 3 5
Luzerne Drums 1 0 1 6 4 0


Luzerne Plains 2 0 null 4 2 null


Lycoming Linden 1 0 1


2 1 2
Lycoming Montoursville 8 4 8


1 1 11
Lycoming Muncy 7 11 1


1 2 3
Montour Montour 1 null 2 7 null 0


Northampton Nazareth 2 null 0 0 null 0.9 0 null 0
Schuylkill Tower City 2 0 0 0 0 0 0 4 7
Washington Venetia 23 10 7





Westmoreland Schramms Farms and Orchard null 18.7 null null 3.7 null


York York 7 null 3.5 24 null 4 1 null 0

Thresholds

Reproductive (tassel/silk) and late vegetative corn attracts moths. Shorten spray schedules when populations increase.

Thresholds Based on CEW Captures

Levels CEW catch / week Spray frequency
almost absent 1–13 4 days to no spray
very low 14–35 5 to 6 day
low 36–70
4 to 5 day
moderate 71–349 3 to 4 day
high > 350 2 to 3 day

If CEW is low, then consider ECB

Levels ECB catch / week Spray frequency
almost absent < 14 no treatment
very low 15–35 6 day
low 38–70 5 day
moderate > 70 4 day
high

Contact Information

Shelby Fleischer
  • Professor of Entomology
Email:
Phone: 814-863-7788